With the master cylinder in the truck, I bleed the MC and prop valve at the same time. This also gives you assurance that the prop valve is not closed in one direction. Remove front and rear line from prop valve, screw in adapters for 1/4" hose on both ends. Attach hoses and route them to open master cylinder (after flushing, by pumping a couple of times). Retain hoses by clipping to MC with ends of hoses submerged. Then it is just a matter of pumping the brakes until the air is bled out.
If the fluid is dirty, (usually I am working on new components), change out the fluid and clean the reservoirs out so that you are not pushing dirt into your system.
Jim
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